Process of making elbows.



vN0. 720,989. v PATENTED FEB. 17, 1903; I G. WILLIAMS.

PROCESS OF MAKING ELBQWS. mummies rum: mm: 19, 1001.

I0 IODEL;

' INVENTOI itnesses 1 r and .maw

UNITED STATES PATENT OFFICE.

CHARLES WILLIAMS, or LANDORE, ENGLAND, ASSIGNOR TO 'rnnnnrrisuMANNESMANN TUBE 00., LIMITED, F LANDORE, ENGLAND.

PROCESS OF MAKING ELBOWS.

SPECIFICATION forming part of Letters Patent No. 720,989, dated Farm,17, 1903.

Application filed June19, 1901.

To all whom, it mayconcern:

Be it known that 1, CHARLES WI LIAMS,- foreman blacksmith, a subject ofthe King of Great Britain, residing at Landore, R. S. 0.,

England, have invented certain new and useful Improvements in theProcess of Making Elbows, &c., (for which I have applied for a patentinGreat Britain, No. 7,472, dated April 11, 1901, and in France, dated May4, 1901,) of which the following is a specification.

This invention relates to a processfor the manufacture of elbows frompieces ofjoint less tubes, as I shall describe, referring to theaccompanying drawings.

Figures 1 to 3, inclusive, show stages in preparing the blank for makingan elbow according to my invention. Figs. 4 and 5 are longitudinalsections of tools for preparing the blank. Fig. 6 is an elevation of theblank with mandrels introduced into it, and Figs. 7 and 8 are elevationsof tools for completing the elbow.

The blank is prepared in any convenient manner so as to have a roundedbulge'm in its middle part. This step of the process forms no part of myinvention; but one mode of effecting this is the following:

The blank I), Fig. 1, having a larger diameter than the branches of thefinished elbow, is put, as shown in Fig. 4, on a mandrel made in halvese f and placed between a pair of dies g h, which are pressed together,so as to reduce the diameter of the ends of the blank, bringing it tothe shape shown in Fig. 2. By first removing endwise the part fof themandrel the part 2 can be taken out of the blank. The blank is next puton a mandrel e' of the same diameter as the branches of the finishedelbow and placed between a pair of transversely-divided diesj k, asshown in Fig. 5,

Serial No. 65,104. in. model.)

trimmed after its formation is completed.

Two short mandrels q, each having its end suitably inclined, areintroduced into the blank, in which they are placed symmetric ally withtheir pointed ends nearly meeting 'over the bulge m. The blank is thenbent between dies. This bending may be effected by pressing the blankbetween one pair of dies, but preferably between successive dies. (Shownin Figs. 7 and 8.) By thus bending a blank made with a bulge on one sidean elbow is manufactured, all the metal of which has its full strength.

Having thus described the nature of this invention and the best means Iknow'of carrying the same into practical effect, I claim- The process ofmanufacturing elbows from jointless tubing, which consists in forming abulge on one side of the tube, then bending said tube in theoppositedirection to elbow shape, and at the same time internallysupporting the blank as set forth; substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

. CHARLES WILLIAMS.

Witnesses:

HENRY ROBI S WM. R. DowNALL.

